Axion searches with the EDELWEISS-II experiment

Abstract

We present new constraints on the couplings of axions and more generic axion-like particles using data from the EDELWEISS-II experiment. The EDELWEISS experiment, located at the Underground Laboratory of Modane, primarily aims at the direct detection of WIMPs using germanium bolometers. It is also sensitive to the low-energy electron recoils that would be induced by solar or dark matter axions. Using a total exposure of up to 448 kg.d, we searched for axion-induced electron recoils down to 2.5 keV within four scenarios involving different hypotheses on the origin and couplings of axions. We set a 95% CL limit on the coupling to photons $g_{A\gamma }<2.13\times 10^{-9}$ GeV${}^{-1}$ in a mass range not fully covered by axion helioscopes. We also constrain the coupling to electrons, $g_{Ae}<2.56\times 10^{-11}$, similar to the more indirect solar neutrino bound. Finally we place a limit on $g_{Ae}\times g_{AN}^{\mathrm{eff}}<4.70\times 10^{-17}$, where $g_{AN}^{\mathrm{eff}}$ is the effective axion-nucleon coupling for ${}^{57}$Fe. Combining these results we fully exclude the mass range $0.91\mathrm{eV}<m_A<80$ keV for DFSZ axions and $5.73\mathrm{eV}<m_A<40$ keV for KSVZ axions.